EP0943385B1 - Dispositif de serrage pour broche porte-outil - Google Patents

Dispositif de serrage pour broche porte-outil Download PDF

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Publication number
EP0943385B1
EP0943385B1 EP99105302A EP99105302A EP0943385B1 EP 0943385 B1 EP0943385 B1 EP 0943385B1 EP 99105302 A EP99105302 A EP 99105302A EP 99105302 A EP99105302 A EP 99105302A EP 0943385 B1 EP0943385 B1 EP 0943385B1
Authority
EP
European Patent Office
Prior art keywords
clamping device
sleeve
spring assembly
draw rod
proximal end
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99105302A
Other languages
German (de)
English (en)
Other versions
EP0943385A1 (fr
Inventor
Michel Zosi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Crid Sa Recherches Industrielles Et Developpements Cie
Original Assignee
Crid Sa Recherches Industrielles Et Developpements Cie
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Crid Sa Recherches Industrielles Et Developpements Cie filed Critical Crid Sa Recherches Industrielles Et Developpements Cie
Publication of EP0943385A1 publication Critical patent/EP0943385A1/fr
Application granted granted Critical
Publication of EP0943385B1 publication Critical patent/EP0943385B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/24—Chucks characterised by features relating primarily to remote control of the gripping means
    • B23B31/26—Chucks characterised by features relating primarily to remote control of the gripping means using mechanical transmission through the working-spindle
    • B23B31/261—Chucks characterised by features relating primarily to remote control of the gripping means using mechanical transmission through the working-spindle clamping the end of the toolholder shank
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/94—Tool-support
    • Y10T408/95—Tool-support with tool-retaining means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/309352—Cutter spindle or spindle support
    • Y10T409/309408—Cutter spindle or spindle support with cutter holder
    • Y10T409/309464—Cutter spindle or spindle support with cutter holder and draw bar

Definitions

  • the invention is in the field of machine tools and relates a clamping device for a tool spindle according to the preamble of independent claim.
  • Clamping devices for tool spindles used in machine tools are used to clamp a tool. They exist usually from a tubular sleeve and one in the sleeve axially limited movable tie rod. The sleeve points one against her distal end of the inner cone, which corresponds to a corresponding Cone is matched to the tools to be used with the spindle (e.g. standardized ISO or HSK interface).
  • the tool is attached to the spindle with the aid of a tool holder Drawbar coupled and the pull rod with a pulling force against that drawn proximal end of the sleeve. This will put the tool cone in the Pulled the inner cone of the sleeve and pressed it into it.
  • the between the tool cone and the inner cone stiffened friction the unit spindle / tool and essentially takes on in operation the torque acting on the tool.
  • the sleeve is rotatably mounted in the spindle housing and carries, for example directly the rotor of an electric motor, with the help of which the clamping device and a tool attached to it are driven.
  • Pull-in force is usually generated by a spring assembly that is preloaded is arranged between the sleeve and the tie rod.
  • a spring assembly that is preloaded is arranged between the sleeve and the tie rod.
  • For the removal of the Tool is attached to the proximal end of the pull rod mostly hydraulically actuated pistons pull the tie rod against the spring force of the spring assembly against the distal sleeve end. This will make the Tool cone pushed out of the inner cone of the sleeve and the connection loosened between tool and pull rod so that the tool is removed can be.
  • the torque that occurs in one operation can act on the tool of a machine tool through the connection between the clamping device and the tool and against limited at the top, especially with a connection via cone / inner cone by the pulling force exerted on the pull rod.
  • the pulling force also affects the static and dynamic Rigidity of the unit consisting of tool and clamping device and thus also affects the achievable machining precision In this context, it is often desirable to increase the tractive force to be able to.
  • the tensile force depends primarily on the spring characteristics (spring constant) of the mentioned, acting between the sleeve and tie rod spring assembly, the usually consists of a plurality of disc springs. Now it shows that it is not easy to adapt the spring characteristics of this spring package to one change significant increase in traction accordingly.
  • the reason for this are the geometric conditions that are essentially given in that the outer diameter of the sleeve through the storage and possibly specified by a motor, the rotor of which it forms.
  • the object of the invention is now a clamping device for a Create tool spindle with dimensions that are essentially related to the dimensions Customary tool spindles are adapted, the inventive Clamping device, for example, a standardized interface for a tool has and in a spindle for a known machine tool can be used, but the connection between the inventive Clamping device and a tool attached to it by a significant higher tensile force should be excellent than that of known clamping devices the case is.
  • the tensioning device has in addition to one in the known way arranged between the sleeve and tie rod biased Spring pack an additional spring pack.
  • This additional spring pack is for operation between the proximal end of the drawbar and the proximal Coupled end of the sleeve and acts parallel to first spring assembly, but it provides the majority of the tractive force.
  • For loosening the tool will first remove the additional spring assembly from the Pull rod decouples, reducing the pulling force, and then in the known way by moving the pull rod against the distal End of the sleeve, that is, by compressing the first spring assembly, the Tool disconnected from the drawbar.
  • a tensioning device according to the invention with, for example, an ISO-25 interface has, for example, a tensile force on the order of 18,000 to 20,000 N compared to a tensile force of the order of magnitude of 3,000 N for a known clamping device with the same interface.
  • FIG. 1 shows an axial section through a schematically illustrated, exemplary embodiment of the clamping device according to the invention for a tool spindle with a distal end directed towards the bottom and a proximal end directed towards the top.
  • This tensioning device has a sleeve 1 with an inner cone 2 at its distal end and a sleeve collar 3 at its proximal end.
  • the sleeve 1 is mounted in a spindle housing in a manner known per se and not shown, and carries the rotor of an electric motor or is operatively connected to such via a gear.
  • the tensioning device also has a pull rod 4 which is arranged coaxially in the sleeve 1 and which carries a tool holder 5 at its distal end.
  • the tool holder 5 and the inner surface of the sleeve 1 are such matched that the tool holder 5 by axial movement the pull rod 4 in the sleeve into a tensioned, that is to say radially compressed, and can be brought into a relaxed position.
  • the tool holder 5 closes positively or frictionally around the proximal end of one on the pull rod 4 tool to be fastened 6; the tool can be in the relaxed position 6 are inserted into the tool holder 5 or removed therefrom.
  • the tool holder 5 is, for example, essentially hollow cylindrical axial slots and is by axial movement of a sleeve area with a larger inner diameter in a sleeve area with a smaller one Diameter from its relaxed position to its tensioned position brought.
  • the tool 6 has a cone 7, the shape of the inner cone 2 Sleeve 1 corresponds.
  • the cone shape is usually standardized (standardized ISO or HSK interface). That with the help of the tool holder 5 to the Drawbar 4 coupled tool 6 is using a against the proximal End of the spindle acting tensile force in the sleeve 1, respectively drawn in the inner cone 2.
  • first spring assembly 8 Between the sleeve 1 and the pull rod 4, or between the Stop 9 of the sleeve and stop 10 of the pull rod is a first spring assembly 8 arranged. By one arranged at the proximal end of the sleeve 1 Limiter 11, the first spring assembly 8 is biased. The inner cone 2 and the limiter 11 are spaced apart from one another in this way, that the pull rod 4 by a tool coupled to the pull rod 4 6 is held in an axial position in which the first spring assembly 8 somewhat is more compressed than in its position defined by the limiter 11 (without tools).
  • the first spring assembly 8 is designed and preloaded for a tensile force that is able to tension at least the tool holder 5, and for a spring travel, the at least the axial path (ejection path) between the tensioned and corresponds to the relaxed position of the tool holder 5.
  • a first spring assembly 8 is used, which consists of approximately twenty disc springs with a diameter of 20mm and with a spring constant 4000 N / mm. These are approx. 1000 to 2000 N. biased.
  • the additional spring assembly 15 is positioned on the sleeve collar 3, which advantageously has a larger outer diameter has than the sleeve 1, the additional spring assembly 15 is positioned.
  • This additional spring assembly 15 is between the sleeve collar 3 and the proximal end of the pull rod 4, on which this, for example has a head 16, biased with the aid of a multi-part closure 17/18.
  • the additional spring assembly 15 has a significantly higher spring constant than the first spring assembly 8, that is, it is with a significantly higher Force compressible by a significantly smaller travel.
  • Additional spring assembly 15 for example, three disc springs with a diameter of approx. 40 mm and a spring constant of approx. 120,000 N / mm used, which are prestressed with a force of approx. 18,000 to 20,000 N. (corresponding spring travel: 3/6 mm).
  • actuating means for example a first hydraulic actuated piston 20 in a cylinder 21 fastened in the spindle housing Compression and thus decoupling of the additional spring assembly 15 and a second piston 22 disposed in one in the first piston 20 Cylinder 23 is hydraulically displaceable.
  • the advantage of this arrangement of two pistons 20 and 21 is that for the compression of the additional spring assembly 15 a large area is created, which It allows the high force necessary for this compression a relatively low hydraulic pressure (approx. 80 bar).
  • FIGS. 2 to 6 again represent the proximal end of the tensioning device as axial sections, namely in the operating state with a tool (not shown) at the distal end of the pull rod 4 (FIG 2), with additional spring assembly 15 (FIG. 3) decoupled from the pull rod 4, with a pull rod 4 (FIG. 4) released for ejecting the tool, with the pull rod 4 in the ejection position (FIG. 5) and in a rest position with prestressed spring assemblies 15 and 8 but without tools ( Figure 6).
  • Figure 2 corresponds essentially to Figure 1.
  • the pull rod 4 is held by the tool, not shown, in a position in which the first spring assembly 8 is biased and the pull rod 4 is not in contact with the proximal limiter 11 (game S.1).
  • the closure 17/18 for coupling the additional spring assembly 15 to the pull rod 4, which closure consists, for example, of a closure ring 17 and two radially movable closure elements 18 (for details see FIG. 7), is designed such that the additional spring assembly 15 is prestressed in the desired manner and that there is some play between the sleeve collar 3 and the locking ring (game p.2).
  • the total pulling force acting on the pull rod 4 and thus the one not shown The tool presses into the inner cone of the sleeve is the sum of the Biasing the first spring assembly 8 and the additional spring assembly 15th
  • FIG. 3 shows the proximal end of the tensioning device according to the invention at a stage in which the additional spring assembly 15 is decoupled from the pull rod 4.
  • This decoupling is brought about by the first actuating means (piston 20, FIG. 1), which presses the locking ring 17 with the force K.1 and compresses the spring assembly 15 by at most the play S.2 between the sleeve collar 3 and locking ring 17. Due to the effect of the force K.1 on the locking ring, the pretension of the additional spring assembly 15 is decoupled from the pull rod 4 and the locking elements 18 are released (play S.3 or S.4). Only a very small spring travel (clearance p.2) is required, for example 0.4mm.
  • FIG. 4 shows the proximal end of the tensioning device with the closure open.
  • the closure elements 18 are moved radially apart, so that the pull rod 4 can be moved axially against the distal end of the sleeve 1 to relax the tool holder (not shown), that is to say to eject the tool.
  • An actuating means must be provided for the radial movement of the closure elements 18. This can be the same, for example, with which the pull rod is moved axially (see FIG. 7).
  • FIG. 5 shows the proximal end of the tensioning device with the pull rod 4 in the ejection position.
  • a force K.2 is necessary which acts on the proximal end of the pull rod 4 and with which the first spring assembly 8 is to be compressed accordingly.
  • This force K.2 is brought about with a second actuating means, for example with the cylinder / piston unit 22/23 (FIG. 1).
  • FIG. 6 shows the proximal end of the tensioning device in an idle state, that means without tools and without the action of the actuating means.
  • FIG. 7 shows a preferred embodiment for a closure for the tensioning device according to the invention.
  • the closure essentially consists, as already in FIGS. 1 to 6 shown from a locking ring 17 and two axially movable locking elements 18. There could be more than two, regularly around the Drawbar 4 arranged closure elements can be provided.
  • the closure elements 18 have a radially inner position (as in FIG. 7 shown), in which they pass under the head 16 of the pull rod 4 (closure closed) and a radially outer position in which they release the head 16 (Clasp open).
  • the closure elements are made by a suitable Means, for example by return springs 30 in the radially inner position held and driven back from the radially outer position to the inner one.
  • the closure elements 18 also each have two sloping towards the inside Control surfaces, which are arranged laterally from the head 16 and with corresponding Control surfaces 32 cooperate on the piston 22.
  • the closure elements preferably have locking means, with the help of which they are locked in their inner position so that they can be locked by a high centrifugal force during operation not against the force of the return springs 30 to be driven into their outer position.
  • the locking means 33 are for example, spring-loaded, two-part locking pins mounted in the locking ring 17 33.1 / 2.
  • the shear surface 34 of the locking pins 33.1 / 2 is without external action on the pins opposite the interface between the Lock ring 17 and the closure elements 18 shifted, thereby a radial displacement of the closure elements 18 is blocked.
  • the locking pins 33.1 / 2 are actuated by corresponding control pins 35 on Pistons 22.
  • a cooperating with the head of the pull rod 4 end face 36 of the Piston 22, the control surfaces 32 for the radial movement of the closure elements 18 and the control pins 35 for unlocking the closure elements 18 are to be arranged on the piston 22 in such a way that when the piston moves 22 against the proximal end of the sleeve 1, first the closure elements 18 unlocked and then moved apart and only then the pull rod 4 is moved in the axial direction.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping On Spindles (AREA)
  • Jigs For Machine Tools (AREA)

Claims (12)

  1. Dispositif de serrage pour broches d'outil, lequel dispositif de serrage présente un manchon (1) et une tringle de traction (4) apte à se déplacer axialement dans le manchon (1), le manchon (1) présentant à son extrémité distale un cône intérieur (2) pour la réception du cône (7) d'un outil (6), la tringle de traction (4) présentant à son extrémité distale un support d'outil (5) qui, par déplacement axial de la tringle de traction (4) dans le manchon (1), peut être amené dans une position serrée et dans une position non serrée, un premier empilement de ressorts précontraints (8) qui sollicite la tringle de traction (4) contre l'extrémité proximale du manchon (4) et le support d'outil (5) dans sa position serrée étant disposé entre le manchon (1) et la tringle de traction (4) pour créer une force de traction sur la tringle de traction (4), et un moyen d'actionnement (22/23) à l'aide duquel la tringle de traction (4) peut être déplacée contre l'extrémité distale du manchon (1) en opposition à la force élastique du premier empilement de ressorts (8) étant prévu à l'extrémité proximale du dispositif de serrage, caractérisé en ce que pour augmenter la force de traction sur la tringle de traction (4), le dispositif de serrage présente un empilement supplémentaire de ressorts (15) qui peut être accouplé sous précontrainte entre l'extrémité proximale du manchon (1) et l'extrémité proximale de la tringle de traction (4), et en ce qu'un autre moyen d'actionnement (20/21) est prévu pour le désaccouplement de l'empilement supplémentaire de ressorts (15) par rapport à la tringle de traction (4).
  2. Dispositif de serrage selon la revendication 1, caractérisé en ce que l'empilement supplémentaire de ressorts (15) présente une constante de ressort nettement plus élevée que celle du premier empilement de ressorts (8).
  3. Dispositif de serrage selon l'une des revendications 1 ou 2, caractérisé en ce qu'une fermeture (18/19) est prévue pour l'accouplement de l'empilement supplémentaire de ressorts (15) à l'extrémité proximale de la tringle de traction (4) et en ce que le moyen d'actionnement (22/23) est équipé de moyens (32, 35) pour l'ouverture et la fermeture avant le déplacement de la tringle de traction (4).
  4. Dispositif de serrage selon l'une des revendications 1 à 3, caractérisé en ce que l'autre moyen d'actionnement est un piston (20) qui peut être déplacé dans un cylindre (21) et en ce que le moyen d'actionnement est également un piston (22) qui peut être déplacé dans un cylindre (23), le cylindre (23) du moyen d'actionnement étant disposé dans le piston (20) de l'autre moyen d'actionnement.
  5. Dispositif de serrage selon l'une des revendications 1 à 4, caractérisé en ce que l'empilement supplémentaire de ressorts (15) est disposé sur un collet de manchon (3) disposé à l'extrémité proximale du manchon (1) et en ce que le diamètre intérieur du collet de manchon (3) est plus grand que celui du manchon (1).
  6. Dispositif de serrage selon la revendication 5, caractérisé en ce que l'empilement supplémentaire de ressorts (15) est constitué d'une pluralité de ressorts en plateau.
  7. Dispositif de serrage selon l'une des revendications 3 à 6, caractérisé en ce que la fermeture en vue de l'accouplement de l'empilement supplémentaire de ressorts (15) à la tringle de traction (4) présente une bague de fermeture (17) et une pluralité d'éléments de fermeture (18) mobiles radialement, les éléments de fermeture (18) coopérant avec une tête (16) disposée sur l'extrémité proximale de la tringle de traction (4).
  8. Dispositif de serrage selon la revendication 7, caractérisé en ce que des surfaces de guidage (32) sont prévues sur l'élément d'actionnement (22/23) pour déplacer les éléments de fermeture (18) mobiles radialement depuis une position située radialement à l'intérieur jusque dans une position située radialement à l'extérieur et en ce qu'un moyen de rappel est prévu pour ramener les éléments de fermeture (18) dans leur position située radialement à l'intérieur.
  9. Dispositif de serrage selon la revendication 8, caractérisé en ce que des ressorts de rappel (30) sont prévus comme moyens de rappel.
  10. Dispositif de serrage selon la revendication 8 ou 9, caractérisé en ce que la fermeture présente des moyens de verrouillage par lesquels les éléments de fermeture (18) mobiles radialement peuvent être verrouillés dans la position située radialement à l'intérieur.
  11. Dispositif de serrage selon la revendication 10, caractérisé en ce que des tiges de verrouillage (33.1) et des corps de verrouillage (33/2) sont prévus comme moyens de verrouillage et forment ensemble une surface coulissante de cisaillement (34).
  12. Dispositif de serrage selon la revendication 10 ou 11, caractérisé en ce que des moyens de commande (35) pour la commande des moyens de verrouillage sont prévus sur le moyen d'actionnement.
EP99105302A 1998-03-18 1999-03-15 Dispositif de serrage pour broche porte-outil Expired - Lifetime EP0943385B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH65298 1998-03-18
CH00652/98A CH692726A5 (de) 1998-03-18 1998-03-18 Spannvorrichtung einer Werkzeugspindel.

Publications (2)

Publication Number Publication Date
EP0943385A1 EP0943385A1 (fr) 1999-09-22
EP0943385B1 true EP0943385B1 (fr) 2002-07-31

Family

ID=4192010

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99105302A Expired - Lifetime EP0943385B1 (fr) 1998-03-18 1999-03-15 Dispositif de serrage pour broche porte-outil

Country Status (6)

Country Link
US (1) US6079919A (fr)
EP (1) EP0943385B1 (fr)
JP (1) JPH11333653A (fr)
CH (1) CH692726A5 (fr)
DE (1) DE59902163D1 (fr)
ES (1) ES2183450T3 (fr)

Families Citing this family (10)

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Publication number Priority date Publication date Assignee Title
DE19955907A1 (de) * 1999-11-20 2001-06-21 Paul Mueller Gmbh & Co Kg Vorrichtung zur Abstützung eines Maschinenteils bei Kraftbeaufschlagung
EP1279451A1 (fr) * 2001-07-24 2003-01-29 Micromeccanica Di Precisione S.r.l. Support pour mandrin porte-outil
JP4378931B2 (ja) * 2002-03-04 2009-12-09 三菱マテリアル株式会社 刃部交換式切削工具及びこれに装着される刃部
JP2004066440A (ja) * 2002-08-09 2004-03-04 Mori Seiki Co Ltd 工作機械の主軸ユニット
JP4730939B2 (ja) * 2004-03-31 2011-07-20 コマツＮｔｃ株式会社 主軸装置
IL164069A (en) * 2004-09-14 2009-06-15 Hanoch Guy Tool assembly
CN102500715A (zh) * 2011-10-31 2012-06-20 芜湖祥达机电有限公司 一种旋边机夹头结构
CN105081796B (zh) * 2014-05-07 2017-12-12 哈尔滨飞机工业集团有限责任公司 一种快速定位夹紧器
CN105397536A (zh) * 2015-10-27 2016-03-16 衡阳纺织机械有限公司 铝杆锭子杆盘组合件铝杆精车加工的夹紧装置
DE102015119060B3 (de) * 2015-11-06 2016-12-15 Ott-Jakob Spanntechnik Gmbh Spannvorrichtung

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US3323419A (en) * 1963-08-20 1967-06-06 Kearney & Trecker Corp Spindle chuck device
US3242819A (en) * 1964-04-06 1966-03-29 Sundstrand Corp Tool adapter with retention means
GB1142322A (en) * 1965-03-04 1969-02-05 Richards & Co Ltd George Tool retainer
CH538327A (de) * 1968-09-04 1973-08-15 Deckel Ag Friedrich Vorrichtung an einer Werkzeugmaschine zum Befestigen und Lösen von Werkzeugen in der Spindel der Werkzeugmaschine
US4604009A (en) * 1985-07-12 1986-08-05 Illinois Tool Works Inc. Tool retention mechanism
US4836723A (en) * 1985-10-08 1989-06-06 Flammini John T Spindle assembly
US4735532A (en) * 1986-12-24 1988-04-05 Gte Valeron Corporation Spindle with positive lock drawbar
US4764064A (en) * 1987-09-25 1988-08-16 Komo Machine Incorporated Tool changer
DE4308736A1 (de) * 1993-03-19 1994-09-22 Kelch & Co Werkzeugmaschf Spann- und Löseeinrichtung für Werkzeuge
JPH08281504A (ja) * 1995-04-14 1996-10-29 Okuma Mach Works Ltd 工具クランプのかけ外し機構

Also Published As

Publication number Publication date
US6079919A (en) 2000-06-27
ES2183450T3 (es) 2003-03-16
CH692726A5 (de) 2002-10-15
JPH11333653A (ja) 1999-12-07
DE59902163D1 (de) 2002-09-05
EP0943385A1 (fr) 1999-09-22

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